Drill sharpener



March 11, 1930. P, A, NELSON 1,749,957

DRILL SHARPENER Filed Sept. 14, 1926 5 Sheets-Sheet l gwuentoz lie. 1. w )jdem.

March 11, 1930. P. A. NELSON DRILL SHARPENBR Filed Sept. 14, 1926 5 Sheets-Sheet 2 March 11, 1930. P. A. NELSON DRILL SHARPENER Filed Sept. 14, 1926 5 Sheets-Sheet 3 an T n R r. L L T n. "I": r l L 1:: I I I In": h E g EH 8 vv 2 E (II \lll J wfi 191 r| & A .M O M gmwnto'a March 11, 1930. P. A. NELSON DRILL SHARPENER Filed Sept. 14, 1926 5 Sheets-Sheet 4 March 11, 1930 P. A. NELSON DRILL SHARPENER Filed Sept. 14, 1926 5 Sheets-Sheet 5 y 8 a DJ/ 5 5-7;

provide amachine'of a relatively simple char- Patented Mar. 11, 1930 UNITED STATES PATENT OFFICE PAUL A. NELSON, OF. DENVER, COLORADO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE GARDNER-DENVER COMPANY, OF QUINCY, ILLINOIS, ,A CORPORATION OF DELAWARE DRILL SI-IARPENER Application filed September 14, 1926.

paratuses for shaping and sharpening'drill steeland like instruments. The object is to acter that is relatively light in weight, so that it can be easily transported and is simple inconstruction and effective in operation.

7 V In the accompanying drawings Figure l-is a rear elevation of the preferred embodiment of the invention, I

Figure 2 is a top plan view of the same,

' Figure 3 is a side elevation, showing the machine removed from its base and'incidentallyindicating that it may be mounted on a bench or other support,

Figure-4 isa vertical sectional view, and A Figure 5 is also a vertical sectional view taken at right angles to Figure 4.

' i In the embodiment disclosed, a base 6 is 7 10 The cross head 10'has in its under face a recessed'seat for a clamping die 12, which die is preferably held" in place by a bolt 13 extending transversely through the cross head 10.

In the cylinder.v located a vertically re- *dollying hammer in 'amanner well underciprocating piston 14 having an upstanding integral extension 15 that passes through a circular opening 16 formed in the head 8, the opposite sides of the extension operating in guideways 17 formed in the inner sides of the side arms 9. The extension is provided in its upper side with a recessed seat 18 that receives a movable die 19 held in place by a clamping bolt 20, the die 19 thus moving upward into coaction with the die 12 upon the elevation of the piston 14 and movable downward out of such coaction. The piston 14 and extension 15 are preferably held against rotation in the cylinder by a tubular guide pin 21 that has a sliding fit in a socket 22 formed in the cylinder head 8. This guide pin has a reduced extensi n 23 that is'engaged in the pis n Serial No. 135,437.

and is secured in place by a nut 24. The guide pin is also provided with vent ports 25 opening into the bore andinto the interior of the cylinder, so as to permit air to flow freely into and out of the socket 22, accordingly as the pin'moves downwardly or upwardly.

' Located on one side of the cylinder and preferably formed integral therewith is a bracket 26 on which is mounted a suitable dollying hammer 27, the dolly 28 of which is adapted to be struck by the piston hammer 29 and thus operate on the work clamped by and-between the dies 12 and 19.

For the purpose of supplying motive fluid to the cylinder 7 to operate the piston 14, and to the'dollying hammer 27 in order to operate on the dolly '28, the following mechanism is preferably employed. A valve casing 30 is mounted on one sideof the bracket 26 and is provided with a tubular bore 31, into one end portion of which fiuidunder pressure is supplied through a suitable hose connection 32 and port '33, aswill beclear by reference particularly to Figures 2 and 3. At'the right of the inlet or supply port 33 there is an internal annular groove 34, from which leads a pipe '35 that'conducts motive fluid from the passageway 36 in the base 6, and this passageway opens into the lower end of the cylinder 7 below the piston 14, as clearly shown in Figure 4. To the right of the groove 34 is another internal groove 37, from which leads a conduit 38,supplying motive fluid to the stood A reciprocatory plunger valve 39 operates in the bore 31', and hasan annular groove 40 that is always in communication with the supply port 33. fThis groove is formed between end heads 41 and 42. The end head 42 is provided with an exhaust port 43 opening into the right hand end of the bore 31-. 'The head 42 obviously traverses the grooves 34and 37 ,and consequently the chan- -nel 40 in which the live fluid is located, may be brought into communication successively connection 45 with the said valve. The cyl inder 7 above the piston 14 is ventedto atmosphere through a port 46.

The operation of the structure is as follows. Assuming air under pressure is su plied to thechamber 40 of the valvercasing and valve, if the valve is in the position shown in Figure 4, this live fluid is cut ofl from both the cylinder 7 and the dollying hammer 27. If now the valve 41 is moved to the right, the chamber 40 will first'be brought into communication with the groove 34, whereupon the motive fluid will flow through the pipe and passageway 36 into the cylinder 7 below the piston, thereby elevatingthe piston and causing the diel9 to move into coaction with the die 12. It will 7 thus clamp a drill steel ,orother article placed between the dies. A further movement of the valve willcause the chamber 40 to be brought into communication with the groove 3.7, whereupon motive fluidwill, findits vway ,to the dollying hammer 27 to cause its operation, so that the dolly will be hammered against theend of the drill steelor other article. When the operation has been completed a reversal of the valve will first cutiofl the motive fluid to .the dollying hammer and then cut oil motive fluid to the cylinder 7 theinotive fluid in'said \cylinclerbelow the piston being permitted to exhaust through thepassageway 36, pipe 375, port 43, and the right hand end of the bore 41, to atmosphere.

the combination with a cylinder member having an upper head and a yoke overhanging the head,of a piston in the cylinder memher having an upstandingdie carrier operating in the yoke, means for securing an upwardly faced die on top of the carrier and a downwardly faced die on the .top of the yoke,

a bracket atone side ofsthe cylinder member,

means mounted on the bracket for operating on work clamped by the dies, a valve mecham a i on the z raeke 2. In a machine of the character set forth,

the combination with a cylinder member having an upper head and a yoke overhanging the head, of a piston in the cylinder member having an upstanding die carrier operating in the yoke, means for securing coacting dies to the carrier and yoke, said cylinder memQ her head having a socket and an upstanding tubular pin carried by the piston and slid- V ably fitted in the socket, the bore of the'pin having communication withthe'interior of the cylinder member above the piston and said interior havingv open communication with atmosphere. v

3. In a machine of the character set forth, the combination with anwuagright cylinder,

of a Pi i h y inder 1 mins a p rtio Pr j g fro mee ing c ampin dies, one of which is carried by the project .in ortion of the oiston a bracketat one hp 1. .A\..| r

side of the cylinder,fl-ui d operated means mounted on the vbracket gfor operating on work clampedby the dies, a valve mechanism mounted on the bracket, said bracket and valve together being narrower than ,the di-" ameter of the cylinder, and means for directs mo iv u d f m the a ve m cha m to the cylinder and to the operated 4- n a mach ne f h ha cte e ort the combination with an nprightcylinder, of Pi ton n t e ey eder a ias a Po t o dies, one of which is carried by the projecting portion of the piston, a support for the other die mounted on and located over the Pr je g ther r m s w g -v ls p s" ioo cylinder, a bracket atone side of thecylin- V der, fluidoperated means mounted on thebracketfor operating on work clampedby the dies, a valve mechanismn iounted on-the bracket. said bracket and valve together being narrower than the diameter of the cylin- (ler, an actuating handle IllQl l d OI ot P-7 per die support and connected -to the valve,

and means for directing finotive from, the valve mechanism to cylinderand to the fluid operated means on the bracket. 7

r In testimony whereof, I n; my signature. PAUL NELSON nism mounted on the bracket, means for ,di-

recting motive fluid from the valve mechanism to the cylinder member below the pieton to raise the lower die lnto coact on with the upper die and to the means mounted on member-aboveit iho 11315 011 bei gat all iim-t open to atmosph re. 

